PLEUROCERA. 89 



I have seen specimens of this shell, but without locality- 

 attached to the label. It much resembles subukire, ^. ,^, 



' Fig. 167 a. 



Lea, and may be a variety of that species, but I 

 have seen no specimens of the latter species which 

 at all resemble this in color. 



The specimens before me and also Mr. Reeve's 

 specimen, as exhibited by his figure, are orna- 

 mented by a narrow yellowish band below the 

 sutures. 



30. P. subulaeforme, Lea, 



Trypanostoma subuheforme, Lea. Proc. Acad. Nat. Sci., p. 174, 1862. Jour. Acad. 

 Nat. Sci., V, pt. 3, p. 289, t. 36, f. 116. Obs., ix, p. 111. 



Description. — Shell carinate, subulate, rather thiu, horn-color; spire 

 atteuuatel}" conical; sutures very much impressed; whorls ten, flat- 

 tened below and carinate above ; aperture small, subrhoraboidal, 

 whitish within ; outer lip acute, sinuous ; columella slightly thickened 

 and twisted. 



Operculum ovate, dark brown, with the polar point near the base 

 slightly on the left. 



Habitat. — Knoxville, Tennessee ; Prof. Troost and W. 



Fig. 168. 



Spillman, M.D. 



Diameter, -39; length, 1-07 inches. 



Observations. — This species is nearly allied to Melania 



(Tnjpanostoma) bicostata, Anth., and in outline and size 



very close to Melania {Tnjpanostoma) Ocoeensis (nobis). 



From bicostata, it may be distinguished by the diflerence in 



the aperture, in being more subulate and in having the carina 



less marked. The channel of bicostata is more retrorse and more 



angular at the point. The aperture is about one-fourth the length of 



the shell. Two of the three specimens before me are without any 



bands, the third has a well-defined brown band within the aperture. It 



is nearly the same in outline as attenuatum herein described, but differs 



in the foi'm of the aperture and in being carinate. 



I doubt whether this is more than the adult form of P. 

 Henryanum, Lea. 



